---
id: CVE-2026-49456
title: Waku is the minimal React framework
summary: >-
  Waku is the minimal React framework. Prior to version 1.0.0-beta.1, the
  unstable_redirect() helper exported from waku/router/server
  (packages/waku/src/router/define-router.tsx:156–161) accepts an arbitrary
  string and reflects it unchange…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-601
vendor: waku
product: waku
affected:
  - waku <= 1.0.0-beta.0
patched:
  - waku 1.0.0-beta.1
published: '2026-09-03'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:20:21.673'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-49456'
references:
  - url: 'https://github.com/wakujs/waku/pull/2090'
    label: security-advisories@github.com
  - url: 'https://github.com/wakujs/waku/releases/tag/v1.0.0-beta.1'
    label: security-advisories@github.com
  - url: 'https://github.com/wakujs/waku/security/advisories/GHSA-43fc-v873-qw85'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-43fc-v873-qw85'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00398
epssPercentile: 0.31144
aliases:
  - GHSA-43fc-v873-qw85
ecosystem: npm
ingestedAt: '2026-07-08T20:46:41.589Z'
---

## Overview

Waku is the minimal React framework. Prior to version 1.0.0-beta.1, the unstable_redirect() helper exported from waku/router/server (packages/waku/src/router/define-router.tsx:156–161) accepts an arbitrary string and reflects it unchanged into the HTTP Location response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper — the natural pattern documented in the JSDoc and official fixtures — is vulnerable to open redirect attacks. An attacker who convinces a victim to click a crafted link can silently redirect the browser to an arbitrary external domain, enabling phishing, credential harvesting, and OAuth token theft. Additionally, scheme-relative URLs (//evil.example/) bypass naive https?://-only allow-list filters that developers might add as ad-hoc mitigations. This issue has been patched in version 1.0.0-beta.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-49456)

Affected packages:

- `waku <= 1.0.0-beta.0`

Patched in:

- `waku 1.0.0-beta.1`

Source: https://github.com/advisories/GHSA-43fc-v873-qw85